Roblox has become a testing ground where kids and teens build their own video games and let others play them. The virtual world has become a way for kids to understand physics, learn coding, and build their own games using Lego-like building blocks.

Roblox, a family-friendly entertainment site that allows kids to build their own 3D game worlds, says players created 5.4 million games in 2011 — a 109 percent year-over-year increase from 2010 — demonstrating enormous growth in user-generated online games in the past year.

Roblox is a thriving web-based virtual world where kids can create building-block creations in Leg0-like styles. It is far more successful than other virtual worlds, and 18-year-old Luke “Stickmaster Luke” Weber is one of the reasons for that.